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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkState;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import static java.util.Collections.unmodifiableList;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>import com.google.common.annotations.GwtCompatible;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import com.google.common.annotations.GwtIncompatible;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import com.google.common.base.Objects;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import com.google.common.base.Preconditions;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.io.IOException;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.io.ObjectInputStream;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.io.ObjectOutputStream;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.io.Serializable;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.AbstractSequentialList;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.util.Collection;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.util.Iterator;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import java.util.List;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import java.util.ListIterator;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import java.util.Map;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import java.util.Map.Entry;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import java.util.NoSuchElementException;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import java.util.Set;<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>import javax.annotation.Nullable;<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>/**<a name="line.44"></a>
<span class="sourceLineNo">045</span> * An implementation of {@code ListMultimap} that supports deterministic<a name="line.45"></a>
<span class="sourceLineNo">046</span> * iteration order for both keys and values. The iteration order is preserved<a name="line.46"></a>
<span class="sourceLineNo">047</span> * across non-distinct key values. For example, for the following multimap<a name="line.47"></a>
<span class="sourceLineNo">048</span> * definition: &lt;pre&gt;   {@code<a name="line.48"></a>
<span class="sourceLineNo">049</span> *<a name="line.49"></a>
<span class="sourceLineNo">050</span> *   Multimap&lt;K, V&gt; multimap = LinkedListMultimap.create();<a name="line.50"></a>
<span class="sourceLineNo">051</span> *   multimap.put(key1, foo);<a name="line.51"></a>
<span class="sourceLineNo">052</span> *   multimap.put(key2, bar);<a name="line.52"></a>
<span class="sourceLineNo">053</span> *   multimap.put(key1, baz);}&lt;/pre&gt;<a name="line.53"></a>
<span class="sourceLineNo">054</span> *<a name="line.54"></a>
<span class="sourceLineNo">055</span> * ... the iteration order for {@link #keys()} is {@code [key1, key2, key1]},<a name="line.55"></a>
<span class="sourceLineNo">056</span> * and similarly for {@link #entries()}. Unlike {@link LinkedHashMultimap}, the<a name="line.56"></a>
<span class="sourceLineNo">057</span> * iteration order is kept consistent between keys, entries and values. For<a name="line.57"></a>
<span class="sourceLineNo">058</span> * example, calling: &lt;pre&gt;   {@code<a name="line.58"></a>
<span class="sourceLineNo">059</span> *<a name="line.59"></a>
<span class="sourceLineNo">060</span> *   map.remove(key1, foo);}&lt;/pre&gt;<a name="line.60"></a>
<span class="sourceLineNo">061</span> *<a name="line.61"></a>
<span class="sourceLineNo">062</span> * changes the entries iteration order to {@code [key2=bar, key1=baz]} and the<a name="line.62"></a>
<span class="sourceLineNo">063</span> * key iteration order to {@code [key2, key1]}. The {@link #entries()} iterator<a name="line.63"></a>
<span class="sourceLineNo">064</span> * returns mutable map entries, and {@link #replaceValues} attempts to preserve<a name="line.64"></a>
<span class="sourceLineNo">065</span> * iteration order as much as possible.<a name="line.65"></a>
<span class="sourceLineNo">066</span> *<a name="line.66"></a>
<span class="sourceLineNo">067</span> * &lt;p&gt;The collections returned by {@link #keySet()} and {@link #asMap} iterate<a name="line.67"></a>
<span class="sourceLineNo">068</span> * through the keys in the order they were first added to the multimap.<a name="line.68"></a>
<span class="sourceLineNo">069</span> * Similarly, {@link #get}, {@link #removeAll}, and {@link #replaceValues}<a name="line.69"></a>
<span class="sourceLineNo">070</span> * return collections that iterate through the values in the order they were<a name="line.70"></a>
<span class="sourceLineNo">071</span> * added. The collections generated by {@link #entries()}, {@link #keys()}, and<a name="line.71"></a>
<span class="sourceLineNo">072</span> * {@link #values} iterate across the key-value mappings in the order they were<a name="line.72"></a>
<span class="sourceLineNo">073</span> * added to the multimap.<a name="line.73"></a>
<span class="sourceLineNo">074</span> *<a name="line.74"></a>
<span class="sourceLineNo">075</span> * &lt;p&gt;The {@link #values()} and {@link #entries()} methods both return a<a name="line.75"></a>
<span class="sourceLineNo">076</span> * {@code List}, instead of the {@code Collection} specified by the {@link<a name="line.76"></a>
<span class="sourceLineNo">077</span> * ListMultimap} interface.<a name="line.77"></a>
<span class="sourceLineNo">078</span> *<a name="line.78"></a>
<span class="sourceLineNo">079</span> * &lt;p&gt;The methods {@link #get}, {@link #keySet()}, {@link #keys()},<a name="line.79"></a>
<span class="sourceLineNo">080</span> * {@link #values}, {@link #entries()}, and {@link #asMap} return collections<a name="line.80"></a>
<span class="sourceLineNo">081</span> * that are views of the multimap. If the multimap is modified while an<a name="line.81"></a>
<span class="sourceLineNo">082</span> * iteration over any of those collections is in progress, except through the<a name="line.82"></a>
<span class="sourceLineNo">083</span> * iterator's methods, the results of the iteration are undefined.<a name="line.83"></a>
<span class="sourceLineNo">084</span> *<a name="line.84"></a>
<span class="sourceLineNo">085</span> * &lt;p&gt;Keys and values may be null. All optional multimap methods are supported,<a name="line.85"></a>
<span class="sourceLineNo">086</span> * and all returned views are modifiable.<a name="line.86"></a>
<span class="sourceLineNo">087</span> *<a name="line.87"></a>
<span class="sourceLineNo">088</span> * &lt;p&gt;This class is not threadsafe when any concurrent operations update the<a name="line.88"></a>
<span class="sourceLineNo">089</span> * multimap. Concurrent read operations will work correctly. To allow concurrent<a name="line.89"></a>
<span class="sourceLineNo">090</span> * update operations, wrap your multimap with a call to {@link<a name="line.90"></a>
<span class="sourceLineNo">091</span> * Multimaps#synchronizedListMultimap}.<a name="line.91"></a>
<span class="sourceLineNo">092</span> *<a name="line.92"></a>
<span class="sourceLineNo">093</span> * &lt;p&gt;See the Guava User Guide article on &lt;a href=<a name="line.93"></a>
<span class="sourceLineNo">094</span> * "http://code.google.com/p/guava-libraries/wiki/NewCollectionTypesExplained#Multimap"&gt;<a name="line.94"></a>
<span class="sourceLineNo">095</span> * {@code Multimap}&lt;/a&gt;.<a name="line.95"></a>
<span class="sourceLineNo">096</span> *<a name="line.96"></a>
<span class="sourceLineNo">097</span> * @author Mike Bostock<a name="line.97"></a>
<span class="sourceLineNo">098</span> * @since 2.0 (imported from Google Collections Library)<a name="line.98"></a>
<span class="sourceLineNo">099</span> */<a name="line.99"></a>
<span class="sourceLineNo">100</span>@GwtCompatible(serializable = true, emulated = true)<a name="line.100"></a>
<span class="sourceLineNo">101</span>public class LinkedListMultimap&lt;K, V&gt;<a name="line.101"></a>
<span class="sourceLineNo">102</span>    implements ListMultimap&lt;K, V&gt;, Serializable {<a name="line.102"></a>
<span class="sourceLineNo">103</span>  /*<a name="line.103"></a>
<span class="sourceLineNo">104</span>   * Order is maintained using a linked list containing all key-value pairs. In<a name="line.104"></a>
<span class="sourceLineNo">105</span>   * addition, a series of disjoint linked lists of "siblings", each containing<a name="line.105"></a>
<span class="sourceLineNo">106</span>   * the values for a specific key, is used to implement {@link<a name="line.106"></a>
<span class="sourceLineNo">107</span>   * ValueForKeyIterator} in constant time.<a name="line.107"></a>
<span class="sourceLineNo">108</span>   */<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>  private static final class Node&lt;K, V&gt; {<a name="line.110"></a>
<span class="sourceLineNo">111</span>    final K key;<a name="line.111"></a>
<span class="sourceLineNo">112</span>    V value;<a name="line.112"></a>
<span class="sourceLineNo">113</span>    Node&lt;K, V&gt; next; // the next node (with any key)<a name="line.113"></a>
<span class="sourceLineNo">114</span>    Node&lt;K, V&gt; previous; // the previous node (with any key)<a name="line.114"></a>
<span class="sourceLineNo">115</span>    Node&lt;K, V&gt; nextSibling; // the next node with the same key<a name="line.115"></a>
<span class="sourceLineNo">116</span>    Node&lt;K, V&gt; previousSibling; // the previous node with the same key<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span>    Node(@Nullable K key, @Nullable V value) {<a name="line.118"></a>
<span class="sourceLineNo">119</span>      this.key = key;<a name="line.119"></a>
<span class="sourceLineNo">120</span>      this.value = value;<a name="line.120"></a>
<span class="sourceLineNo">121</span>    }<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span>    @Override public String toString() {<a name="line.123"></a>
<span class="sourceLineNo">124</span>      return key + "=" + value;<a name="line.124"></a>
<span class="sourceLineNo">125</span>    }<a name="line.125"></a>
<span class="sourceLineNo">126</span>  }<a name="line.126"></a>
<span class="sourceLineNo">127</span><a name="line.127"></a>
<span class="sourceLineNo">128</span>  private transient Node&lt;K, V&gt; head; // the head for all keys<a name="line.128"></a>
<span class="sourceLineNo">129</span>  private transient Node&lt;K, V&gt; tail; // the tail for all keys<a name="line.129"></a>
<span class="sourceLineNo">130</span>  private transient Multiset&lt;K&gt; keyCount; // the number of values for each key<a name="line.130"></a>
<span class="sourceLineNo">131</span>  private transient Map&lt;K, Node&lt;K, V&gt;&gt; keyToKeyHead; // the head for a given key<a name="line.131"></a>
<span class="sourceLineNo">132</span>  private transient Map&lt;K, Node&lt;K, V&gt;&gt; keyToKeyTail; // the tail for a given key<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span>  /**<a name="line.134"></a>
<span class="sourceLineNo">135</span>   * Creates a new, empty {@code LinkedListMultimap} with the default initial<a name="line.135"></a>
<span class="sourceLineNo">136</span>   * capacity.<a name="line.136"></a>
<span class="sourceLineNo">137</span>   */<a name="line.137"></a>
<span class="sourceLineNo">138</span>  public static &lt;K, V&gt; LinkedListMultimap&lt;K, V&gt; create() {<a name="line.138"></a>
<span class="sourceLineNo">139</span>    return new LinkedListMultimap&lt;K, V&gt;();<a name="line.139"></a>
<span class="sourceLineNo">140</span>  }<a name="line.140"></a>
<span class="sourceLineNo">141</span><a name="line.141"></a>
<span class="sourceLineNo">142</span>  /**<a name="line.142"></a>
<span class="sourceLineNo">143</span>   * Constructs an empty {@code LinkedListMultimap} with enough capacity to hold<a name="line.143"></a>
<span class="sourceLineNo">144</span>   * the specified number of keys without rehashing.<a name="line.144"></a>
<span class="sourceLineNo">145</span>   *<a name="line.145"></a>
<span class="sourceLineNo">146</span>   * @param expectedKeys the expected number of distinct keys<a name="line.146"></a>
<span class="sourceLineNo">147</span>   * @throws IllegalArgumentException if {@code expectedKeys} is negative<a name="line.147"></a>
<span class="sourceLineNo">148</span>   */<a name="line.148"></a>
<span class="sourceLineNo">149</span>  public static &lt;K, V&gt; LinkedListMultimap&lt;K, V&gt; create(int expectedKeys) {<a name="line.149"></a>
<span class="sourceLineNo">150</span>    return new LinkedListMultimap&lt;K, V&gt;(expectedKeys);<a name="line.150"></a>
<span class="sourceLineNo">151</span>  }<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span>  /**<a name="line.153"></a>
<span class="sourceLineNo">154</span>   * Constructs a {@code LinkedListMultimap} with the same mappings as the<a name="line.154"></a>
<span class="sourceLineNo">155</span>   * specified {@code Multimap}. The new multimap has the same<a name="line.155"></a>
<span class="sourceLineNo">156</span>   * {@link Multimap#entries()} iteration order as the input multimap.<a name="line.156"></a>
<span class="sourceLineNo">157</span>   *<a name="line.157"></a>
<span class="sourceLineNo">158</span>   * @param multimap the multimap whose contents are copied to this multimap<a name="line.158"></a>
<span class="sourceLineNo">159</span>   */<a name="line.159"></a>
<span class="sourceLineNo">160</span>  public static &lt;K, V&gt; LinkedListMultimap&lt;K, V&gt; create(<a name="line.160"></a>
<span class="sourceLineNo">161</span>      Multimap&lt;? extends K, ? extends V&gt; multimap) {<a name="line.161"></a>
<span class="sourceLineNo">162</span>    return new LinkedListMultimap&lt;K, V&gt;(multimap);<a name="line.162"></a>
<span class="sourceLineNo">163</span>  }<a name="line.163"></a>
<span class="sourceLineNo">164</span><a name="line.164"></a>
<span class="sourceLineNo">165</span>  LinkedListMultimap() {<a name="line.165"></a>
<span class="sourceLineNo">166</span>    keyCount = LinkedHashMultiset.create();<a name="line.166"></a>
<span class="sourceLineNo">167</span>    keyToKeyHead = Maps.newHashMap();<a name="line.167"></a>
<span class="sourceLineNo">168</span>    keyToKeyTail = Maps.newHashMap();<a name="line.168"></a>
<span class="sourceLineNo">169</span>  }<a name="line.169"></a>
<span class="sourceLineNo">170</span><a name="line.170"></a>
<span class="sourceLineNo">171</span>  private LinkedListMultimap(int expectedKeys) {<a name="line.171"></a>
<span class="sourceLineNo">172</span>    keyCount = LinkedHashMultiset.create(expectedKeys);<a name="line.172"></a>
<span class="sourceLineNo">173</span>    keyToKeyHead = Maps.newHashMapWithExpectedSize(expectedKeys);<a name="line.173"></a>
<span class="sourceLineNo">174</span>    keyToKeyTail = Maps.newHashMapWithExpectedSize(expectedKeys);<a name="line.174"></a>
<span class="sourceLineNo">175</span>  }<a name="line.175"></a>
<span class="sourceLineNo">176</span><a name="line.176"></a>
<span class="sourceLineNo">177</span>  private LinkedListMultimap(Multimap&lt;? extends K, ? extends V&gt; multimap) {<a name="line.177"></a>
<span class="sourceLineNo">178</span>    this(multimap.keySet().size());<a name="line.178"></a>
<span class="sourceLineNo">179</span>    putAll(multimap);<a name="line.179"></a>
<span class="sourceLineNo">180</span>  }<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span>  /**<a name="line.182"></a>
<span class="sourceLineNo">183</span>   * Adds a new node for the specified key-value pair before the specified<a name="line.183"></a>
<span class="sourceLineNo">184</span>   * {@code nextSibling} element, or at the end of the list if {@code<a name="line.184"></a>
<span class="sourceLineNo">185</span>   * nextSibling} is null. Note: if {@code nextSibling} is specified, it MUST be<a name="line.185"></a>
<span class="sourceLineNo">186</span>   * for an node for the same {@code key}!<a name="line.186"></a>
<span class="sourceLineNo">187</span>   */<a name="line.187"></a>
<span class="sourceLineNo">188</span>  private Node&lt;K, V&gt; addNode(<a name="line.188"></a>
<span class="sourceLineNo">189</span>      @Nullable K key, @Nullable V value, @Nullable Node&lt;K, V&gt; nextSibling) {<a name="line.189"></a>
<span class="sourceLineNo">190</span>    Node&lt;K, V&gt; node = new Node&lt;K, V&gt;(key, value);<a name="line.190"></a>
<span class="sourceLineNo">191</span>    if (head == null) { // empty list<a name="line.191"></a>
<span class="sourceLineNo">192</span>      head = tail = node;<a name="line.192"></a>
<span class="sourceLineNo">193</span>      keyToKeyHead.put(key, node);<a name="line.193"></a>
<span class="sourceLineNo">194</span>      keyToKeyTail.put(key, node);<a name="line.194"></a>
<span class="sourceLineNo">195</span>    } else if (nextSibling == null) { // non-empty list, add to tail<a name="line.195"></a>
<span class="sourceLineNo">196</span>      tail.next = node;<a name="line.196"></a>
<span class="sourceLineNo">197</span>      node.previous = tail;<a name="line.197"></a>
<span class="sourceLineNo">198</span>      Node&lt;K, V&gt; keyTail = keyToKeyTail.get(key);<a name="line.198"></a>
<span class="sourceLineNo">199</span>      if (keyTail == null) { // first for this key<a name="line.199"></a>
<span class="sourceLineNo">200</span>        keyToKeyHead.put(key, node);<a name="line.200"></a>
<span class="sourceLineNo">201</span>      } else {<a name="line.201"></a>
<span class="sourceLineNo">202</span>        keyTail.nextSibling = node;<a name="line.202"></a>
<span class="sourceLineNo">203</span>        node.previousSibling = keyTail;<a name="line.203"></a>
<span class="sourceLineNo">204</span>      }<a name="line.204"></a>
<span class="sourceLineNo">205</span>      keyToKeyTail.put(key, node);<a name="line.205"></a>
<span class="sourceLineNo">206</span>      tail = node;<a name="line.206"></a>
<span class="sourceLineNo">207</span>    } else { // non-empty list, insert before nextSibling<a name="line.207"></a>
<span class="sourceLineNo">208</span>      node.previous = nextSibling.previous;<a name="line.208"></a>
<span class="sourceLineNo">209</span>      node.previousSibling = nextSibling.previousSibling;<a name="line.209"></a>
<span class="sourceLineNo">210</span>      node.next = nextSibling;<a name="line.210"></a>
<span class="sourceLineNo">211</span>      node.nextSibling = nextSibling;<a name="line.211"></a>
<span class="sourceLineNo">212</span>      if (nextSibling.previousSibling == null) { // nextSibling was key head<a name="line.212"></a>
<span class="sourceLineNo">213</span>        keyToKeyHead.put(key, node);<a name="line.213"></a>
<span class="sourceLineNo">214</span>      } else {<a name="line.214"></a>
<span class="sourceLineNo">215</span>        nextSibling.previousSibling.nextSibling = node;<a name="line.215"></a>
<span class="sourceLineNo">216</span>      }<a name="line.216"></a>
<span class="sourceLineNo">217</span>      if (nextSibling.previous == null) { // nextSibling was head<a name="line.217"></a>
<span class="sourceLineNo">218</span>        head = node;<a name="line.218"></a>
<span class="sourceLineNo">219</span>      } else {<a name="line.219"></a>
<span class="sourceLineNo">220</span>        nextSibling.previous.next = node;<a name="line.220"></a>
<span class="sourceLineNo">221</span>      }<a name="line.221"></a>
<span class="sourceLineNo">222</span>      nextSibling.previous = node;<a name="line.222"></a>
<span class="sourceLineNo">223</span>      nextSibling.previousSibling = node;<a name="line.223"></a>
<span class="sourceLineNo">224</span>    }<a name="line.224"></a>
<span class="sourceLineNo">225</span>    keyCount.add(key);<a name="line.225"></a>
<span class="sourceLineNo">226</span>    return node;<a name="line.226"></a>
<span class="sourceLineNo">227</span>  }<a name="line.227"></a>
<span class="sourceLineNo">228</span><a name="line.228"></a>
<span class="sourceLineNo">229</span>  /**<a name="line.229"></a>
<span class="sourceLineNo">230</span>   * Removes the specified node from the linked list. This method is only<a name="line.230"></a>
<span class="sourceLineNo">231</span>   * intended to be used from the {@code Iterator} classes. See also {@link<a name="line.231"></a>
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</pre>
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